HTTPS rewrite???

When you look at [HTTP::host] it's going to be true if it looks like this

https://test.domain.com/app/login.do

or

https://test.domain.com

or

https://test.domain.com/whatever/

This is why it's going to keep redirecting and looping through the same irule

What you need to do is determine if there is a uri, meaning "/app/login.do"

So you rewrite the logic

 
 when HTTP_REQUEST {    
    if { ([HTTP::host] equals "test.domain.com") and [HTTP::uri] equals "/" } {    
         HTTP::redirect https://test.domain.com/app/login.do  
       }    
 } 
 

This should then only trigger the redirect when the request hits the vip as http(s)://test.domain.com/

hope this helps

CB